Immersion Fatshark SpiroNET CP Patch 5.8GHz Antenna (SMA) 13dBi Gain Specs: Connector: SMA compatible with all FatShark/ImmersionRC 5.8GHz products Polarization: Right-hand circular 5.8GHz ISM Band Gain: 13dBi  Beam width: 35 degrees (H + V) F/B ratio: 26dB, VSWR is < 1.5:1 (5740 - 5860MHz). Impedance: 50 ohms. Size: 92x92mm